Games like Alpha Zoo
Games like Alpha Zoo include Slime Rancher, Scribblenauts Unlimited, Slime Rancher 2, Terraria, and Wobbly Life. We matched them by the tags players give Alpha Zoo on Steam (Adventure, Casual, Education, Sandbox, and Creature Collector): closest matches first, and among equally close ones the better-known games.

Slime Rancher
Shared: Adventure · Sandbox · Cute

Scribblenauts Unlimited
Shared: Casual · Adventure · Sandbox

Slime Rancher 2
Shared: Adventure · Creature Collector · Casual

Terraria
Shared: Sandbox · Adventure · 2D

Wobbly Life
Shared: Adventure · Sandbox · Casual

Growtopia
Shared: Adventure · Casual · Sandbox

WEBFISHING
Shared: Casual · Creature Collector · Cute

Pikuniku
Shared: Adventure · Casual · Cute

Palworld
Shared: Creature Collector · Adventure · Sandbox

Starbound
Shared: Sandbox · Adventure · Casual

Tiny Glade
Shared: Sandbox · Casual · Building

House Flipper
Shared: Casual · Sandbox · Education

Bugsnax
Shared: Adventure · Creature Collector · Casual

Thank Goodness You're Here!
Shared: Adventure · Casual · 2D

Florence
Shared: Casual · Adventure · Indie

Strange Jigsaws
Shared: Adventure · Casual · 2D

Carto
Shared: Adventure · Cute · Indie

Labyrinth City: Pierre the Maze Detective
Shared: Adventure · Casual · Colorful

Garry's Mod
Shared: Sandbox · Casual · Building

Kabuto Park
Shared: Casual · Creature Collector · Cute

Keplerth
Shared: Adventure · Sandbox · Casual

Old Man's Journey
Shared: Adventure · Casual · Hand-drawn

A Short Hike
Shared: Adventure · Casual · Cute

SPORE™
Shared: Sandbox · Casual · Adventure

